Water gun



FIG. 1 is a front left side perspective view of a water gun showing an embodiment of our new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a right side elevational view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a rear elevational view thereof;

FIG. 6 is a left side elevational view thereof; and,

FIG. 7 is a bottom plan view thereof. 

We claim the ornamental design for a water gun, as shown and described. 